8. Discrepancy measures and significance levels. City of Baltimore is interested in determining if the Neighbourhood property crime rate per 1,000 residents has decreased from 2011 to 2014. (a) (1 mark) State an appropriate discrepancy measure. (b) (1 marks) Why should we randomly swap property crime rates within a neighbourhood instead of randomly shuffling all the property crime rates. (c) (1 marks) Describe in words what a significance level is. (d) (3 marks) If we had multiple discrepancy measures, describe a way to combine them into a single discrep- ancy measure